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(No Model.) 2 Sheets-Sheet 1.

B. S. FLANDERS; DOOR FOR SIGNAL BOXES AND SIMILAR APPARATUS.

No. 346,847. Patented Aug. 3', 1886.

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N4 PETERS, Fhoto-Lilhographor. Wanhinginn, D. Q

(No Model.) A 2 Sheets-Sheet 2. B. S. PLANDERS.

DOOR FOR SIGNAL BOXES AND SIMILAR APPARATUS.

No. 346,847. Patented Aug. 3, 1886..

N. PETERS. PholmLilhogr-mphnr, Waihingtan. D.C.

NITE D rares- BROIVN S. FLANDERS, OF BOSTON, MASS, ASSIGNOR TO THE TOOKER FIRE ALARM IMPROVEMENT COMPANY, OF CHICAGO, ILL.

DOOR FOR SIGNAL-BOXES AND SIMILAR APPARATUS.

SPECIFICATION forming part of Letters Patent No. 346,847, dated August 3, 1886.

Application filed June 30, 1884. Serial No. 136,388. (No model.) I

To all whom it -may concern.-

Beitknown that 1, BROWN S. FLANDERS, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Doors for Signal-Boxes and Similar'Apparat-us,

of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

My invention is intended as an improve ment on apparatus of that class shown in Letters Patent No. 164,406, dated June 1:), 1875,1n which a knob or handle is employed to actuate the latch of the door of a fire-alarm signalr5 box, so as to give access to the signal-transmitting mechanism; also actuates an audible alarm at the box, thereby attracting attention, and thus acting to deter persons from giving a false or unnecessary alarm.

The present invention consists in improvements in the mechanism that actuates the local alarm, and the latch of the door, having for its object to simplify the said mechanism and render it more perfect and easy in operation.

Figure 1 shows in elevation the inner side of the door with the unlocking or latch actuating and alarm-sounding mechanism; Fig. 2, a horizontal sect-ion thereof on line :0 00, showing the mechanism in plan view; and Figs. 3

0 and 4 details to be referred to.

The mechanism is actuated by a knob, or preferably a T-shaped handle, a, at the outside of the door I) on the box,which may contain a fire-alarm-transmitting mechanism or any other apparatus which is intended to be accessible to persons when necessary,but which it is desirable to protect from being tampered with at other times. The said handle a is fixed upon a shaft or spindle, 0, extending through the door I), and provided at its inner end with-a crank, d, the end of which is provided with a sliding spring-pressed projection,

e, which normally engages a shoulder on a catch or pawl, f, connected by a pivot, f, with atoothed disk, g, turning loosely on the shaft 0. Theteeth of the disk 9 are properly shaped to engage the pallets of an escapement-anchor,

it, having attached to it abell-hammer, i,which when the said anchor is vibrated by the teethof the disk strikes upon a gong or audible signal device, is, producing a loud and continuous alarm while the said disk is being rotated. After the crank (Z has been rotated about half a turn, carrying the disk g with it, the end of the said crank arrives in proper 5 5 position to act on a projection, on, connected with the latch or bolt n of'the door, which is shown as having its end, a, beveled, and is acted upon by a spring, n tending to throw the end of the bolt outward to engage the socket or recess in the boX, which is not herein shown. At about the time that the crank d thus arrives in position to engage the bolt,

so as to permit the opening of the door, the inclined endf of the catch fengages a projection, 0, which causes the said catch to turn on its pivot, disengaging it from the projection 6 of the crank d, and thus leaving the said crank free to turn independently of the disk 9 to operate the bolt n.

Fig. 4 illustrates the operation of the catch or pawl f and crank d, the parts being shown in full lines in the normal position with the projection e of the crank d engaged with the pawl, so that when the said crank is turned it will carry the pawl and disk with it until it arrives at the dotted line position, when the disengaging projection 0 turns the pawl or catch f to the position shown in dotted lines, disengaging it from the projection e of the crank (I, so that the disk 9 is free to turn back. The disk 9 meshes with a toothed wheel, p, causing the latter to rotate when the disk 9 is turned by the crank d, and the wheel 1) is connected with a spring, 1", which in the said rotation is strained, and thus stores sufficient power to rotate the wheel 1) and disk 9 in the reverse direction as soon as the latter is re leased or disengaged from the crank d by the tripping of the catch f by the projection 0, as just described, and the said disk 9 in thus making its return movement also actuates the bell-hammer i, prolonging the alarm produced by the gong 7c. The movement of the catch f on its pivotf is limited byprojec'tionf entering a notch in the said catch and the return movement of the disk gwhen actuated by the spring 9' is limited by a stop, t, which also turns the said catch into the position to engage the yielding end piece e of the crank. The spindle c of the crank and handle is acted upon by a spring, u, tending to turn it back to engage the catch f, and the end piece, 6, of the said crank is made yielding, as shown in Fig. 3, to permit it to pass the catch f in the said return movement of 'the crank which is limited by a stop, 10.

When it is desired to open the door, the operator turns the handle a, and with it the crank d and disk 9 engaged with the said crank by the catch f, thus producing an alarm on the gong, and also straining or winding up the spring 1'. At the end of the said movement the catch f is tripped or disengaged by the projection 0 of the disk 1 and turned back by the spring 1', producing a further operation of the alarm k. The crank d is thus left free to operate the bolt n and open the door.

I claim-- 1. The handle and connected crank and toothed disk concentric therewith and a catch pivoted on the said disk for engaging the said crank, combined with adisengaging device for the said catch and a spring strained or wound up by the said disk in its movement produced by the crank, by which the said disk is rotated when disengaged from the said crank in the reverse direction to that produced by the crank, substantially as described. I

2. The handle and connected crank, prothe yielding projection of the crank and the disk permitted to turn back under the action of the spring, the other stop limiting the said backwardmovement and holding the catch in position to be engaged by the yielding projection of the crank, substantially as described.

In testimony whereof I have signed my name I to this specification in the presence of two subscribing witnesses.

BROYVN S. FLANDERS.

Witnesses:

UZZIEL PUTNAM, J 0s. 1?. LIVERMORE. 

